diff --git a/.travis.yml b/.travis.yml
index b3461a932d280fed28be426a54bb030d63d000b2..bc22a9cb241aa2d94d01fd05e4675654e504500e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -93,6 +93,7 @@ script:
- opt_enable_adv FWRETRACT
- opt_set ABL_GRID_POINTS_X 16
- opt_set ABL_GRID_POINTS_Y 16
+ - opt_set_adv FANMUX0_PIN 53
- build_marlin
#
# Test a simple build of AUTO_BED_LEVELING_UBL
diff --git a/Marlin/Conditionals_post.h b/Marlin/Conditionals_post.h
index a98985373c04ab5c36891aad83555076f3429314..773434962738b3e81289f2f6822fae55e79f30db 100644
--- a/Marlin/Conditionals_post.h
+++ b/Marlin/Conditionals_post.h
@@ -688,6 +688,11 @@
#endif
#define WRITE_FAN_N(n, v) WRITE_FAN##n(v)
+ /**
+ * Part Cooling fan multipliexer
+ */
+ #define HAS_FANMUX PIN_EXISTS(FANMUX0)
+
/**
* Servos and probes
*/
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index fc7865401cab5ba64b0772054d7f2ae54b12b008..beb77165c3dbcadfe9e450289858d0749f2a7670 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 8b38ecdf14517f29aeefccd184f09c6ee32a94cf..f6b7fd755767fb10a6c6dc9e149d9101a38f0e6f 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -10271,6 +10271,31 @@ inline void invalid_extruder_error(const uint8_t e) {
#endif // PARKING_EXTRUDER
+#if HAS_FANMUX
+
+ void fanmux_switch(const uint8_t e) {
+ WRITE(FANMUX0_PIN, TEST(e, 0) ? HIGH : LOW);
+ #if PIN_EXISTS(FANMUX1)
+ WRITE(FANMUX1_PIN, TEST(e, 1) ? HIGH : LOW);
+ #if PIN_EXISTS(FANMUX2)
+ WRITE(FANMUX2, TEST(e, 2) ? HIGH : LOW);
+ #endif
+ #endif
+ }
+
+ FORCE_INLINE void fanmux_init(void){
+ SET_OUTPUT(FANMUX0_PIN);
+ #if PIN_EXISTS(FANMUX1)
+ SET_OUTPUT(FANMUX1_PIN);
+ #if PIN_EXISTS(FANMUX2)
+ SET_OUTPUT(FANMUX2_PIN);
+ #endif
+ #endif
+ fanmux_switch(0);
+ }
+
+#endif // HAS_FANMUX
+
/**
* Perform a tool-change, which may result in moving the
* previous tool out of the way and the new tool into place.
@@ -10353,7 +10378,7 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
current_position[Y_AXIS] -= hotend_offset[Y_AXIS][active_extruder] - hotend_offset[Y_AXIS][tmp_extruder];
current_position[Z_AXIS] -= hotend_offset[Z_AXIS][active_extruder] - hotend_offset[Z_AXIS][tmp_extruder];
- // Activate the new extruder
+ // Activate the new extruder ahead of calling set_axis_is_at_home!
active_extruder = tmp_extruder;
// This function resets the max/min values - the current position may be overwritten below.
@@ -10687,14 +10712,19 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
select_multiplexed_stepper(tmp_extruder);
#endif
+ // Set the new active extruder
+ active_extruder = tmp_extruder;
+
#endif // HOTENDS <= 1
#if ENABLED(SWITCHING_EXTRUDER) && !DONT_SWITCH
stepper.synchronize();
- move_extruder_servo(tmp_extruder);
+ move_extruder_servo(active_extruder);
#endif
- active_extruder = tmp_extruder;
+ #if HAS_FANMUX
+ fanmux_switch(active_extruder);
+ #endif
SERIAL_ECHO_START();
SERIAL_ECHOLNPAIR(MSG_ACTIVE_EXTRUDER, (int)active_extruder);
@@ -13434,7 +13464,11 @@ void setup() {
SET_OUTPUT(E_MUX1_PIN);
SET_OUTPUT(E_MUX2_PIN);
#endif
-
+
+ #if HAS_FANMUX
+ fanmux_init();
+ #endif
+
lcd_init();
#ifndef CUSTOM_BOOTSCREEN_TIMEOUT
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index 57128d3f1c1c6bee16ca517a980a2bee1534d8b2..79ced8bf8e11eb133b5cb1e79b0e278a2b842702 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -443,6 +443,16 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
#endif
#endif
+/**
+ * Part-Cooling Fan Multiplexer requirements
+ */
+#if PIN_EXISTS(FANMUX1)
+ #if !HAS_FANMUX
+ #error "FANMUX0_PIN must be set before FANMUX1_PIN can be set."
+ #endif
+#elif PIN_EXISTS(FANMUX2)
+ #error "FANMUX0_PIN and FANMUX1_PIN must be set before FANMUX2_PIN can be set."
+#endif
/**
* Limited number of servos
diff --git a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration_adv.h b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration_adv.h
index 723d3d12ef063d532575f6c7030392d1ba1b1fab..8c52ba38a86e262e482badc4e964f4502c876c1c 100644
--- a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration_adv.h
+++ b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Anet/A6/Configuration_adv.h b/Marlin/example_configurations/Anet/A6/Configuration_adv.h
index 24ee3e25cca039eaa3363381e7173bc6b1bb66c7..fbb7573a3f0623c6dae8653b3c33bb29cbd40f74 100644
--- a/Marlin/example_configurations/Anet/A6/Configuration_adv.h
+++ b/Marlin/example_configurations/Anet/A6/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Anet/A8/Configuration_adv.h b/Marlin/example_configurations/Anet/A8/Configuration_adv.h
index 0ff1fb0d1a5132e50bded8b479857468560cec5c..4812733d5c7ad33f30979ce872642606f6d37852 100644
--- a/Marlin/example_configurations/Anet/A8/Configuration_adv.h
+++ b/Marlin/example_configurations/Anet/A8/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/BQ/Hephestos/Configuration_adv.h b/Marlin/example_configurations/BQ/Hephestos/Configuration_adv.h
index e2a20f6da2b2094a30f10fa72fa5a46f9415b2f8..aed6aad1994ba3dc2094aa214bc03d46ce16a1c0 100644
--- a/Marlin/example_configurations/BQ/Hephestos/Configuration_adv.h
+++ b/Marlin/example_configurations/BQ/Hephestos/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/BQ/Hephestos_2/Configuration_adv.h b/Marlin/example_configurations/BQ/Hephestos_2/Configuration_adv.h
index 2e4365a97d1f066be1cc1dcd90d0fb87d0275e16..b0dbdadba2d7805f2103f4640218855cb1dec313 100644
--- a/Marlin/example_configurations/BQ/Hephestos_2/Configuration_adv.h
+++ b/Marlin/example_configurations/BQ/Hephestos_2/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/BQ/WITBOX/Configuration_adv.h b/Marlin/example_configurations/BQ/WITBOX/Configuration_adv.h
index e2a20f6da2b2094a30f10fa72fa5a46f9415b2f8..aed6aad1994ba3dc2094aa214bc03d46ce16a1c0 100644
--- a/Marlin/example_configurations/BQ/WITBOX/Configuration_adv.h
+++ b/Marlin/example_configurations/BQ/WITBOX/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Cartesio/Configuration_adv.h b/Marlin/example_configurations/Cartesio/Configuration_adv.h
index b30fdf2ecc3780668d6789dcc5fab50777d91bfd..6782e070f932a9f412eb17f58efc730c2b9639e5 100644
--- a/Marlin/example_configurations/Cartesio/Configuration_adv.h
+++ b/Marlin/example_configurations/Cartesio/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 35
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Felix/Configuration_adv.h b/Marlin/example_configurations/Felix/Configuration_adv.h
index 706bf132e867d722774f3ccf67cb8f5f234b1cca..638915b9189f0675cd58841617964db10878a69d 100644
--- a/Marlin/example_configurations/Felix/Configuration_adv.h
+++ b/Marlin/example_configurations/Felix/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Folger Tech/i3-2020/Configuration_adv.h b/Marlin/example_configurations/Folger Tech/i3-2020/Configuration_adv.h
index c8ee383db9acce0ad846c487857ce9e1611ce0c6..960b1b5f8b25d578aab6ba2432eaaf2d807b94fa 100644
--- a/Marlin/example_configurations/Folger Tech/i3-2020/Configuration_adv.h
+++ b/Marlin/example_configurations/Folger Tech/i3-2020/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Infitary/i3-M508/Configuration_adv.h b/Marlin/example_configurations/Infitary/i3-M508/Configuration_adv.h
index 598f44138911be788f82f8dd98c438085e97f72f..751759c30acdd0a19ec3953690b4b4f65bbb81dd 100644
--- a/Marlin/example_configurations/Infitary/i3-M508/Configuration_adv.h
+++ b/Marlin/example_configurations/Infitary/i3-M508/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Malyan/M150/Configuration_adv.h b/Marlin/example_configurations/Malyan/M150/Configuration_adv.h
index 4cd6f6766b28d307b9faa23a756ddbf6a29351e2..4a7930605dc459e162d87cb19d93f130bd6d2c2d 100644
--- a/Marlin/example_configurations/Malyan/M150/Configuration_adv.h
+++ b/Marlin/example_configurations/Malyan/M150/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/RigidBot/Configuration_adv.h b/Marlin/example_configurations/RigidBot/Configuration_adv.h
index 1bf0406965991efa02274b90a17f137439d41fef..8fbd278c7ef08be268bf3893dc760386266b05fb 100644
--- a/Marlin/example_configurations/RigidBot/Configuration_adv.h
+++ b/Marlin/example_configurations/RigidBot/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index 0c7b8b4e3f14ca0af3e6c7dc3a80bfbf2c45d8e5..cab69c2b109a77648da45a85b7f4bf053ae45e56 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
index 543dcd8762cb9a13215921f57df3785b453b111b..95630746dd51d28c123fe11baae821f6015dbaf9 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Velleman/K8200/Configuration_adv.h b/Marlin/example_configurations/Velleman/K8200/Configuration_adv.h
index 0960203a60406ad2b037209e6592a99b211cca0f..1a31f5eda8665b618a9a7275ceeba08a131401ad 100644
--- a/Marlin/example_configurations/Velleman/K8200/Configuration_adv.h
+++ b/Marlin/example_configurations/Velleman/K8200/Configuration_adv.h
@@ -233,6 +233,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/Velleman/K8400/Configuration_adv.h b/Marlin/example_configurations/Velleman/K8400/Configuration_adv.h
index 7a28615d62b8b1ef382aa56e8d69b33d1a9ec424..998b25bac6038b1488fc59f57a3dc8b9f2c6cee8 100644
--- a/Marlin/example_configurations/Velleman/K8400/Configuration_adv.h
+++ b/Marlin/example_configurations/Velleman/K8400/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
index 7b47e138b66955e1efe464948343607f2b7d2a0f..3715a421ac48e7666b22186c9ef5cb0c07aa6d5a 100644
--- a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
index b48a6f8e647d1c63a36523ae7b0cb5a19cc3855c..e4eaec7c477fb52dcaee540a48a9b501499aff2c 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/generic/Configuration_adv.h b/Marlin/example_configurations/delta/generic/Configuration_adv.h
index b48a6f8e647d1c63a36523ae7b0cb5a19cc3855c..e4eaec7c477fb52dcaee540a48a9b501499aff2c 100644
--- a/Marlin/example_configurations/delta/generic/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/generic/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
index b48a6f8e647d1c63a36523ae7b0cb5a19cc3855c..e4eaec7c477fb52dcaee540a48a9b501499aff2c 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
index 5cdd4aae74cc89aa0086a67e86de7fbaa9784d28..ffabd4eed91e9b6662b02dcb6fcd56f5dda2dad8 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
@@ -225,6 +225,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
index 4816afd25a5d9a6d4fccebacd029ca7718a9615d..57dc10197856bdd776e9f2b718146cf4cc314c75 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration_adv.h b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration_adv.h
index 54b75428afe1094df692f547f944d6dad5ced88e..b6df0fe5ee3b2e9a9737fd30ca8a206bcda866b9 100644
--- a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration_adv.h
+++ b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index 82fe996790a5e5fc9d7ec78d5e51bbfde103b278..2e755a1ecc2ad7a260d0adb511d50bccd18dcb3f 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
index 7a61aff1f19b17f530faadd331f59179fe59ce72..fc07c0456db0069944f28a8e6ff8e493f27b906a 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/example_configurations/wt150/Configuration_adv.h b/Marlin/example_configurations/wt150/Configuration_adv.h
index bed6afd6bccf2ddfc0134ed47f5d3fde7441e716..d8f6c3a3b0d002bc7bd103d9b15bbe3e9547941c 100644
--- a/Marlin/example_configurations/wt150/Configuration_adv.h
+++ b/Marlin/example_configurations/wt150/Configuration_adv.h
@@ -220,6 +220,17 @@
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed
+/**
+ * Part-Cooling Fan Multiplexer
+ *
+ * This feature allows you to digitally multiplex the fan output.
+ * The multiplexer is automatically switched at tool-change.
+ * Set FANMUX[012]_PINs below for up to 2, 4, or 8 multiplexed fans.
+ */
+#define FANMUX0_PIN -1
+#define FANMUX1_PIN -1
+#define FANMUX2_PIN -1
+
/**
* M355 Case Light on-off / brightness
*/
diff --git a/Marlin/pins.h b/Marlin/pins.h
index 99cb18756e0a3d05b41454d46961e82f053bbd66..fbf2331da1f705af95440a1c3b0b7d2eef173782 100644
--- a/Marlin/pins.h
+++ b/Marlin/pins.h
@@ -280,6 +280,16 @@
#define CONTROLLER_FAN_PIN -1
#endif
+#ifndef FANMUX0_PIN
+ #define FANMUX0_PIN -1
+#endif
+#ifndef FANMUX1_PIN
+ #define FANMUX1_PIN -1
+#endif
+#ifndef FANMUX2_PIN
+ #define FANMUX2_PIN -1
+#endif
+
#ifndef HEATER_0_PIN
#define HEATER_0_PIN -1
#endif